pic 2. the plant that is in the upper left hand corner.
and the leaf margins:
This looks like the result of
excessive heat,
root problems (possibly from
overwatering) and/or suffering from
extreme humidity levels (such as very high or low humidity).
When the serrated edges of marijuana leaves curls or tipped up like that, it’s often a sign of temperature stress, overwatering/root problems or extreme humidity levels. This plant was overwatered and living in high heat, which is what caused these symptoms.